ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The effective Debye-Waller parameters,B eff, were determined along thec- anda-axes on two kinds of coke and a thermal black with different heat-treatment temperatures. FromB eff values at room temperature and around 90 K, the dynamic component,B d, and the Debye temperature,θ D, for the thermal vibration of atoms, and the static component,B S, due to static displacement of atoms, were determined separately. The development of graphite structure detected by the decreases in interlayer spacing,d 002 and the growth of crystallites caused decreases in bothB d andB S. The thermal black had a much largerB d andB s, which was probably caused from retention of its spherical particles even after heat-treatment at high temperatures. The Debye temperature for the in-plane vibration, [θ1D] a , increased remarkably with the decrease ind 0002, and that for the out-of-plane vibration, [θD] c , increased slightly, which corresponded to a remarkable increase in anisotropy with heat treatment. The Debye temperatures showed apparent dependences onB s which could be extrapolated to the Debye temperatures alonga- andc-axes for the single crystal graphite atB s = 0. The present results on Debye-Waller parameters agree with the results on structural studies obtained by X-ray diffraction and high resolution electron microscopy.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01145524
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